Hiroki Moriya of Japan hits a return to Ivan Dodig of Croatia during their men's singles match. Dodig won 6-0, 6-1, 6-2.(EDUARDO MUNOZ/REUTERS)

Spectators take shelter during a sudden downpour at the U.S. Open tennis tournament in New York August 27, 2012.(LUCAS JACKSON/REUTERS)

Maria Sharapova of Russia serves to Melinda Czink of Hungary during their women's singles match at the U.S. Open tennis tournament in New York August 27, 2012. Sharapova advanced 6-2, 6-2.(KEVIN LAMARQUE/REUTERS)

Lucie Safarova of the Czech Republic signs autographs after defeating Melanie Oudin of the U.S. 6-4, 6-0 during their women's singles match at the U.S. Open tennis tournament in New York August 27, 2012.(JESSICA RINALDI/REUTERS)

A girl naps in the stands at the U.S. Open tennis tournament in New York August 27, 2012.(JESSICA RINALDI/REUTERS)

Britain's Andy Murray returns a shot to Alex Bogomolov Jr., of Russia. Murray advanced to the next round with a 6-2, 6-4, 6-1 victory.(Mike Groll/AP)

Aleksandra Wozniak of Canada hits a return against Alexandra Cadantu of Romania during their women's singles match at the U.S. Open tennis tournament in New York August 27, 2012. Wozniak won 6-0, 6-3.(EDUARDO MUNOZ/REUTERS)

Lucie Safarova, of Czechoslovakia, returns a shot to Melanie Oudin in the first round of play at the 2012 US Open tennis tournament, Monday, Aug. 27, 2012, in New York.(Kathy Willens/AP)

(BEN SOLOMON/NYT)

Florian Mayer, of Germany, returns a shot to Jack Sock in the first round of play at the 2012 U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. Stock won 6-3, 6-2, 3-2.(Mel C. Evans/AP)

Young tennis fans wait to have their tennis balls signed by Britain's Andy Murray after he beat Alex Bogomolov Jr., of Russia, at the 2012 U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York.(Mike Groll/AP)

Ball boys stand before a match at the U.S. Open tennis tournament in New York August 27, 2012.(JESSICA RINALDI/REUTERS)

A ball boy wearing a prosthetic blade retrieves a ball during a match at the U.S. Open tennis tournament in New York August 27, 2012.(JESSICA RINALDI/REUTERS)

Workers drying the court in Arhtur Ashe Stadium following heavy rain at the U.S. Open tennis tournament, in New York, Aug. 27, 2012. Rain delayed early matches.(EARL WILSON/NYT)

Samantha Stosur, of Australia, setting up to serve against Petra Martic, of Croatia, in the first round of a women's singles match in Arthur Ashe Stadium during the U.S Open tennis tournament, in New York, Aug. 27, 2012. Stosur won 6-1, 6-1.(BEN SOLOMON/NYT)

Jamie Hampton of the U.S. reacts after a missed point against Marion Bartoli of France during their women's singles match at the U.S. Open tennis tournament in New York August 27, 2012. Bartoli won 6-3, 7-6 (5).(JESSICA RINALDI/REUTERS)